| |
4AA|Mixed Mineral Manure and 400 lbs. | |
| Ammonia-salts (= 82 lbs. Nitrogen) | 49.8 | 50.2
| 6 years, 1852-'57 | |
|Mixed Mineral Manure and 200 lbs. | |
| Ammonia-salts (= 41 lbs. Nitrogen) | |
| 10 years, 1858-'67 | |
|Mixed Mineral Manure and 275 lbs. | |
| Nitrate Soda (= 41 lbs. Nitrogen) | |
| 4 years, 1868-'71 | |
| | |
4C |Mixed Mineral Manure and 2000 lbs. | |
| Rape-cake (= 95 lbs. Nitrogen) | 36.3 | 63.7
| 6 years, 1852-'57 | |
|Mixed Mineral Manure and 1000 lbs. | |
| Rape-cake (= 47.5 lbs. Nitrogen) | |
| 14 years, 1858-'71 | |
| | |
7 |14 tons Farmyard-Manure every year. | 10.7 | 89.3
----+-----------------------------------------+----------+----------
Oats--3 Years, 1869-1871.
----+-----------------------------------------+----------+----------
4 |Mixed Mineral Manure and 400 lbs. | |
| Ammonia-salts (= 82 lbs. Nitrogen) | 51.9 | 48.1
6 |Mixed Mineral Manure and 550 lbs. | |
| Nitrate Soda (= 82 lbs. Nitrogen) | 50.4 | 49.6
----+-----------------------------------------+----------+----------

[Note 1: 13 years only, 1852-1864.]

[Note 2: 475 lbs. Nitrate = 71 lbs. Nitrogen in 1852; 275 lbs.
= 41 lbs. Nitrogen in 1853 and 1854; 550 lbs. = 82 lbs. Nitrogen
each year afterwards.]

It is not necessary to make any comments on this table. It speaks for
itself; but it does not tell half the story. For instance, in the case
of wheat and barley, it gives the average result for 20 years. It shows
that when 100 lbs. of nitrogen in a soluble and available form, are
applied to wheat, about 68 lbs. are _left in the soil_. But you must
recollect that 100 lbs. was applied again the next year, and no account
is taken of the 68 lbs. left in the soil--and so on for 20 years. In
other words, on plot 8, for instance, 2,460 lbs. of nitrogen have been
applied, and only 775 lbs. have been recovered in